package Java.Lock;


import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;


//Lock接口实现多线程间的通信

//第一步 创建资源，定义属性和操作方法
class TShare {
    private int number = 0;

    //创建lock
    private Lock lock = new ReentrantLock();
    private Condition condition = lock.newCondition();

    //+1
    public void incr() throws InterruptedException {
        //上锁
        lock.lock();
        try {
            //判断
            while (number != 0) {   //防止虚假唤醒问题
                condition.await();
            }
            //干活
            number++;
            System.out.println(Thread.currentThread().getName() + ": : " + number);

            //通知
            condition.signalAll();
        } finally {
            //解锁
            lock.unlock();
        }

    }

    //-1

    public void decr() throws InterruptedException {
        try {
            lock.lock();
            while (number != 1) {
                condition.await();
            }
            number--;
            System.out.println(Thread.currentThread().getName() + ": : " + number);
            condition.signalAll();

        } finally {
            lock.unlock();
        }
    }
}

public class LThreadDemo {
    //第三步 创建多个线程，实现资源类和方法
    public static void main(String[] args) {
        TShare share = new TShare();
        new Thread(() -> {
            for (int i = 1; i <= 10; i++) {
                try {
                    share.incr();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "AA").start();

        new Thread(() -> {
            for (int i = 1; i <= 10; i++) {
                try {
                    share.decr();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "BB").start();

        new Thread(() -> {
            for (int i = 1; i <= 10; i++) {
                try {
                    share.incr();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "CC").start();

        new Thread(() -> {
            for (int i = 1; i <= 10; i++) {
                try {
                    share.decr();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }, "DD").start();


    }

}

